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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A
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AWS Certified Developer: Eligibility Criteria

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The below is complete eligibility criteria is as follows- One or more years of hands-on experience designing and maintaining an AWS-based application.

In-depth knowledge of at least one high-level programming language. Understanding of core AWS services, uses, and basic architecture best practices.
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Proficiency in designing, developing, and deploying cloud-based solutions using AWS.

Experience with developing and maintaining applications written for Amazon Simple Storage Service, Amazon DynamoDB, Amazon Simple Queue Service, Amazon Simple Notification Service, Amazon Simple Workflow Service, AWS Elastic Beanstalk, and AWS CloudFormation.







Related: AWS Basics for Software Engineer

The requirement for Developer Exam

  • Professional experience using AWS technology
  • Hands-on experience programming with AWS APIs
  • Understanding of AWS Security best practices
  • Understanding of automation and AWS deployment tools
  • Understanding storage options and their underlying consistency models
  • Excellent understanding of at least one
  • Understanding of stateless and loosely coupled distributed applications
  • Familiarity developing with RESTful API interfaces
  • Basic understanding of relational and non-relational databases
  • Familiarity with messaging & queuing services These training courses or other equivalent methodologies will assist in exam preparation:
  • Developing on AWS (aws.amazon.com/training/developing)
  • In-depth knowledge or training in at least one high-level programming language

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Comments

  1. infosavvy0July 29, 2020 at 5:20 PM

    Nice post! It is really very helpful for us. If anyone want to know the details about AWS

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